MetaMask Controller - Convert to EventEmitter

app/scripts/background.js

@@ -22,7 +22,6 @@ const controller = new MetamaskController({
   setData,
   loadData,
 })
-const keyringController = controller.keyringController
 const txManager = controller.txManager
 function triggerUi () {
   if (!popupIsOpen) notification.show()
@@ -81,13 +80,11 @@ function setupControllerConnection (stream) {
   stream.pipe(dnode).pipe(stream)
   dnode.on('remote', (remote) => {
     // push updates to popup
-    controller.ethStore.on('update', controller.sendUpdate.bind(controller))
-    controller.listeners.push(remote)
-    keyringController.on('update', controller.sendUpdate.bind(controller))
-
+    var sendUpdate = remote.sendUpdate.bind(remote)
+    controller.on('update', sendUpdate)
     // teardown on disconnect
     eos(stream, () => {
-      controller.ethStore.removeListener('update', controller.sendUpdate.bind(controller))
+      controller.removeListener('update', sendUpdate)
       popupIsOpen = false
     })
   })

app/scripts/metamask-controller.js

@@ -1,3 +1,4 @@
+const EventEmitter = require('events')
 const extend = require('xtend')
 const EthStore = require('eth-store')
 const MetaMaskProvider = require('web3-provider-engine/zero.js')
@@ -13,12 +14,12 @@ const autoFaucet = require('./lib/auto-faucet')
 const nodeify = require('./lib/nodeify')
 const IdStoreMigrator = require('./lib/idStore-migrator')
 
-module.exports = class MetamaskController {
+module.exports = class MetamaskController extends EventEmitter {
 
   constructor (opts) {
+    super()
     this.state = { network: 'loading' }
     this.opts = opts
-    this.listeners = []
     this.configManager = new ConfigManager(opts)
     this.keyringController = new KeyringController({
       configManager: this.configManager,
@@ -62,6 +63,7 @@ module.exports = class MetamaskController {
     })
 
     this.ethStore.on('update', this.sendUpdate.bind(this))
+    this.keyringController.on('update', this.sendUpdate.bind(this))
   }
 
   getState () {
@@ -165,10 +167,7 @@ module.exports = class MetamaskController {
   sendUpdate () {
     this.getState()
     .then((state) => {
-
-      this.listeners.forEach((remote) => {
-        remote.sendUpdate(state)
-      })
+      this.emit('update', state)
     })
   }